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The importance of sullage (grey-water) treatment for the restoration and conservation of urban streams

Idris, Azni and Wan Azmin, Wan Nor and Mohd Soom, Mohd Amin and Mamun, Abdullah Al (2005) The importance of sullage (grey-water) treatment for the restoration and conservation of urban streams. International Journal of River Basin Management, 3 (3). pp. 223-227. ISSN 1571-5124 E-ISSN 1814-2060

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Sullage (grey-water) is one of the major point pollution sources, which is discharged from residential and commercial areas into the rivers without any treatment. This study was conducted to determine the pollution characteristics of sullage from a 6.14-hectare residential area where it is discharged into an urban stream without any treatment; and thereafter, to evaluate its probable consequences on the water quality of urban streams. Analyses of the hourly samples revealed that the sullage from residential area was polluted due to high concentration of BOD, COD, Ammoniacal Nitrogen (AN), Orthophosphate (PO4) and TKN, and low concentration of DO. Mean concentrations of the above-mentioned parameters from 72 samples were 51, 123, 5.4, 2.15, 2.15 and 1.62 mg/l, respectively. Further analyses of data revealed that, on average, the sullage was equivalent to Class V water as defined by the water quality index (WQI) in NationalWater Quality Standards (INWQS) of Malaysia. Most of the urban streams drain return water (wastewater) from the settlements and lack adequate baseflow to dilute the wastewaters. As such, if the return waters are not treated then the urban streams shall never be able to achieve the required goals. Domestic sewage and industrial wastewaters are treated to some extent, to achieve the standards stated in Environmental Quality Act, 1979. On the contrary, although quantity and quality of sullage plays important role on stream water quality, it is neither taken care of by any agency nor controlled by any standard. As such, it is important to make necessary technical, institutional and legal arrangement to treat sullage up to certain standard before it find its way into the urban streams.

Item Type: Article (Journal)
Additional Information: 5174/57015
Uncontrolled Keywords: Sullage; residential area; urban stream; water pollution; water quality
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA170 Environmental engineering. Sustainable engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering > Department of Civil Engineering
Depositing User: Dr Abdullah Al Mamun
Date Deposited: 23 May 2017 12:06
Last Modified: 03 Jul 2017 15:26
URI: http://irep.iium.edu.my/id/eprint/57015

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